Bulldozer tooth



2 Sheets-Sheet l I J. c. MURPHY BULLDOZER TOOTH Filed Feb. 7, 1945 Sept.18, 1945.

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BULLDOZER TOOTH Filed Feb. '7, 1945 2 Sheets-Sheet 2 Inventor By QMmZz-Mand Wavy fiMg meted Sept..18, 1945 usurso- STATES PATENT 4 OFFICE.

one-half to Paul Weaver, Frannie, W

Application February 7, 1945, Serial No. 578,517 2 Claims. (262- 8) Hiepresent invention relatesgenerally to that v class of grading machinesknown as bulldozers and more particularly to an improved bulldozertooth.

One of the principal objects of the invention is to provide a bulldozertooth which may be quickly attached to any bulldozer blade and moldboardfor the purpose of breaking, shale, rock, frost or other material toohard for aconventionai bulldozer blade to penetrate.

.Another object of the invention resides in the provision of a device ofthis character which is readily adjustable on the bulldozer blade andmoldboard, which may be used without injury to said blade and moldboard,and which may be conveniently carried on the frame of the bulldozer forimmediate .use, thus eliminating the need for heavy trailing equipment.

A further object of the invention is to provide a bulldozer tooth whichis simple in construction,

highly efficient in use, and which maybe manufactured in quantity at lowunit cost.

Other objects of the invention, not specifically mentioned hereinabove,will become apparent as th description proceeds.

In the drawings forming a part of my applica= tion:

Figure 1 is. a front elevation of a bulldozer moldboard and bladeequipped with a pair of the teeth forming the subject matter of myinvention, said teeth being shown in dotted lines in alternatepositions. l'lg'ure 2 is an enlarged detail plan view showing theadjustable mounting for the upper end of the tooth.

Figure 3 is a side elevation of my invention in proper position on themoldboard and blade.

Figure-4 is a perspective view of the invention. Referring now moreparticularly to the drawings, wherein similar reference numerals will beused to designate like parts, the numeral i indi cates generally abulldozer moldboard which is of conveniently to receive the upper andlower edges of the blade 2 so that said blade will eflectively 'retainthe lower end of the tooth in proper operative position on themoldboard.

Within the recess 1 the body is notched, as at 8, to receive a brace 9which extends transversely at each side of said body and tends toprevent rocking of the tooth on the moldboard i. Similarly, the rearedge of the body 4 is notched medially of its length, as shown at iii,to receive a brace I i which provides further bracing against'rockingmovement of the tooth.

As best seen in Figure 4 of the drawings. the

' 2 and 3, adjustably mounts the tooth on the conventional constructionand which is provided b at its lower edge with a hardened steel blade 2.The moldboard shown is of arcuate cross-section. The improved bulldozertooth iorming the subject matter of my invention is indicated gener Yally at I and includes an arcuate elongated body 4 which terminates atits lower end in a forwardly curved point 5. The rear edge of the lowerend portion ofthe body terminates in a heel 8, and,

directly above said heel said body is notched to define a recess 1. Asbest seen in Figure 3, the

moldboard. More specifically, the clamping plate it'is formed with 9.depending lip II which is undercut obliquely, as at it, to engage therear edge of the moldboard i. A set screw [1 is threaded through anopening. which communicates between th forward end of the-plate II andthe slot it, so that its inner end ensazes the front face of the shanki2. Tightening of the .set screw will urge the body 4 into tightengagement with the moldboard I so that the tooth 8 will be limitedagainst accidental displacement.

A look nut is is carried on the screw i1 and is tightened for securingsaid screw in an adjusted position. v

In Figure 1, I have shown two of mybulldozer' teeth in position on amoldboard. It should be understood, however, that as many teeth asdesired may be used. The teeth may be moved to diiferent positions onthe moldboard I, or removed entirely therefrom, by simply loosening thescrew I! for relieving pressure on'the shank 12.

My improved bulldozer tooth has proven particularly eifective fordigging close to vertical banks, which operation cannot be accomplishedby trailing rooters. Moreover, the invention has proven highlysuccessful when used for breaking shale, frost, rock, hardpan and othersubstances too hard for an ordinary bulldozer blade topene trate.

Itshould be understood that various modiflcations may be made in theinvention without departing from the spirit thereof. For example,

the body I will have to be made in diflerent sizes and slightlydifferent shapes to conform to differupper and lower walls of the recessare shaped 55 cut makes and sizes ofbulldozers.

board, and a clamping plate engageable with l0 the shank tor mountingthe tooth on a bulldozer moldboard.

2. As a new article 01' manufacture, a bulldozer tooth comprising anelongated arcuate body terminating at one end in a. sharpened point,said body being formed at its upper end with a reduced aqua-red shankand with a recess medially of the length of its rear wall, and a bracecarried in the recess.

JOSEPH CLYDE MURPHY.

